A repairman charges an inspection fee plus $30 per hour. A customer with a coupon for 40% off the inspection fee pays $84 for a 2-hour repair. How many hours are worked when a customer pays $130 without a coupon?

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

How are algebraic expressions evaluated using substitution?